Experimental Measurement and Theoretical Analysis of Rectangular Waveguide Filters for C-band Satellite Antenna Systems

In this paper we carried out theoretical and experimental investigations of band-pass filters based on a rectangular waveguide for 4 GHz frequency range. The frequency dependences of the total transmission coefficient and the reflection coefficient of the band-pass filter were analyzed for three variants of size of the aperture window. The concept of equivalent lumped elements was applied to characterize the diaphragms of inductive type. Both experimental and theoretical values of the quality factor for the band-pass filters were determined. Measured quality factors are in the range of 47–128 for transfer resonators of 4 GHz resonance frequencies. In addition, frequency dependences of reflection and transmission coefficients were depicted for theoretical and experimental results. Obtained functions, resonance frequencies and quality factors are in good agreement. Developed and analyzed rectangular waveguide sections with diaphragms can be widely applied in band-pass filters for satellite antenna systems.